Zimbra Collaboration Suite is described as 'Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors' and is a Mail Server in the office & productivity category. There are more than 50 alternatives to Zimbra Collaboration Suite for a variety of platforms, including Web-based, Linux, Self-Hosted, Windows and Mac apps. The best Zimbra Collaboration Suite alternative is Microsoft 365 Copilot, which is free. Other great apps like Zimbra Collaboration Suite are Google Workspace, Roundcube, mailcow: dockerized and Nextcloud Hub.
Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited mail accounts, storage, attachment size, custom logo. Free for commercial use.
China
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
MailShogun is a plugin that creates domain emails easily. You can pick between your professional and regular e-mail address when sending or receiving from your regular g-mail account. One of the cheapest mail forwarding services you can find on the web.
Sanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets blog, forums and tickets in one. iStore is an online store.
China
The AI-powered client portal for professional & creative services. Streamline client onboarding and deliver a stellar customer experience.
DeskNow is a fully featured and easy to use mail and collaboration server with build-in antivirus and antispam. SyncML for mobile devices is separately licensed.
EmailSuccess, an advanced SMTP Server (MTA) built from the ground up to handle the most critical reliability, performance, security, and deliverability requirements.
Italy
EU
A privacy-first, all-in-one ecosystem that replaces Google Workspace and Creative Cloud. Features encrypted email, cloud storage, and docs, alongside a browser-based 3D animation engine and AI assistant. Your data stays yours.
United States
Turnkey Solutions for the Enterprise Cloud
Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.
The Front Door To Your Business – The only all-in-one system. Control every aspect of your business with our all-in-one performance management platform for your teams (employees, partners and suppliers).
United Kingdom
Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
United States
